package com.cya.forumproject.interceptor;

/**
 * @author ：陈奕安（3048279304@qq.com）
 * @date ：Created in 2025/9/21 15:56
 * @description：
 * @modified By：
 * @version:
 */

import com.cya.forumproject.config.AppConfig;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

/**
 * 定义拦截器
 */
@Component
public class LoginInterceptor implements HandlerInterceptor {
    @Value("${forum-project.login.url}")
    private String defaultURL;
    /**
     * 前置处理，对请求的预处理
     * @param request current HTTP request
     * @param response current HTTP response
     * @param handler chosen handler to execute, for type and/or instance evaluation
     * @return ture :继续流程 ，false：流程中断
     * @throws Exception
     */
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        //获取session对象
        HttpSession session = request.getSession(false);
        //判断session是否有效
        if (session!=null&&session.getAttribute(AppConfig.USER_SESSION)!=null){
            //已通过
            return true;
        }
        //检验url是否正确
        if (!defaultURL.startsWith("/")){
            defaultURL="/"+defaultURL;
        }
        //校验不通过
        response.sendRedirect(defaultURL);
        //中断流程
        return false;
    }
}